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It could well be just the fan itself is going out. The power supply itself has one fan, and likely there are others in the system. Find the noisy one and replace it. I have had the actual power supply fan dies on me. Open it up, and replace the fan. That or get a new PS fan if you don't fell like opening up the PS.
Maybe it is some other fan that is making noise.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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